Piston and piston ring



March 15, 1932. c. N. TEETOR 1,849,698

PISTON AND PISTON RING 2 Filed June 21, 1930 77 JV k HHHIMIHI Patented Mar. 15, 1932 UNITED STATES PATENT OFFICE CHARLES N. TEETOR, F HAGERSTOWN, INDIANA, ASSIGNOB TO THE PERFECT CIRCLE COMPANY, OF HAGERSTO'WN, INDIANA, A CORPORATION OF INDIANA ris'ron AND PISTON 1mm Application filed June 21,

My invention relates to pistons and piston rings for internal combustion engines and more particularly to slotted rings for conveying the excess lubricant from the cylinder 6 wall and preventing oil pumping.

The principal object ofmy invention is to provide an improved slotted oil ring hav ing the outer portions of the drain slots widened to provide narrow ribs having parallel sides and cylinder contacting-surfaces of minimum area.

This and other objects of my invention will more fully appear from the following specification, reference being had to the accoml5 panying drawings in which;

Fig. 1 is a detailed vertical section taken through part of a piston and ring embodying my invention;

Fig. 2 is a plan View of the ring; and

Fig. 3 is an edge elevation of the same.

The piston 4, which operates in the cylinder 5 of the internal combustion engine, may be of any desired form and as usual is pro vided with the ordinary compression rings 2 6. The bottom ring groove 7 has drain apertures 8 extending to the interior of the piston so that the excess lubricant scraped from the cylinder wall by .mygi nproved ring 9 may be returned to the crankjgcase,

My ring 9 is provided with equally spaced slots 10 separated by triangular shaped bridges 11. The inner portions 10 of the slots are narrow and of uniform width and the outer portions 10" are wider than the inner portions and are of uniform width.

In making the ringvthe narrow slots are first formed by a suitable tool. Then the outer portions of the slots are widened by circular saws to provide the very narrow ribs 12 which are of uniform width and have parallel sides. The bottom surfaces 13 of the slots on either side of the inner portions 10 of the slots are arcuate, being deepest at points midway between the ends of the slots. By widening the outer portions of the slots, the cylinder contacting surfaces of the ribs are materially reduced so that .their combined area is less than one-half of the entire area of the exterior faceof the ring. Thus the pressure of the ring against the cylinder wall,

1930. Serial No. 462,711.

per unit area of contacting surface, is increased and' the ring functlons much more efficiently.

I claim:

In combination with an engine piston having an annular groove with apertures extending therefrom to the interior of the piston to permit the draining of excess lubricant from my name.

CHARLES N. TEETOR. 

